Any way to see what is preventing my PC from hibernating

Skeeter

Skeeter

Skeeter

Caporegime
Joined
8 Mar 2007
Posts
37,146
Location
Surrey
Is there an application or anything that can be run to identify what is stopping my PC from automatically hibernating after 15 minutes of inactivity. It used to in the past, but recently it has stopped.
 
Nothing has changes in my power options. The screen still goes off after 10 mins, but the setting to hibernate after 15 just doesn't kick in :(
 
If running Vista or 7, open a cmd prompt as admin and run:

powercfg -energy -output C:\energy-report.html

Leave your PC alone until it has done its trace [60 seconds or so]. It will generate a file in the path you give it above. You can probably ignore any USB-related errors, as my system generates these and sleeps without issue.
 
Cheers Sirius. Looks like an audio device has requested to prevent the PC sleeping. Ill change that and see what happens.
 
I have no tab in Device Manager for any power properties of my Audio device? Any ideas how to stop devices requesting to prevent sleep?
 
There may be an option in the audio card's control panel, rather than the Device Manager tools.

Also, what device is it? Searching for your audio card plus preventing sleep may produce a hit. It is odd for an audio card to prevent sleep though - my PC will quite happily go to sleep in the middle of a movie if I forget to change modes! :p
 
Its Steam!

Used powercfg -requests in cmd to find that the issue was an Audio stream was in use. Opened up the full audio mixer and Steam was in there, which was odd as its just open, not actually in a game or anything. Closed Steam, no error in powercfg -requests and the error about an audio device requesting to prevent the PC sleeping has gone too...

Just have to see if it works now. And then figure out what has changed in Steam to make it hold open either a speaker or mic channel?
 
Steam sometimes plays videos in the background - even after you have closed Steam. Perhaps something was still running?
 
Looks like its a bug with Steam following a recent update, looking at the Steam forums. After playing a game or watching a trailer it doesn't 'let go' of the audio stream properly.

Looks like I will just have to remember to close Steam once i'm done untill they fix it.
 
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